import axios from "axios";
import { Notification, MessageBox, Message } from "element-ui";
import store from "@/store";
import { getToken } from "@/utils/auth";
import errorCode from "@/utils/errorCode";

const queue = [] // 请求队列
// 创建axios实例
const service = axios.create({
  // axios中请求配置有baseURL选项，表示请求URL公共部分
  baseURL: process.env.VUE_APP_BASE_API,
  // 超时
  timeout: 10 * 60 * 1000,
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded; charset=utf-8'
  }
});
// 取消重复请求
const removeRepeatRequest = config => {
  for (const key in queue) {
    const index = +key
    const item = queue[key]

    if (
      item.url === config.url &&
      item.method === config.method &&
      JSON.stringify(item.params) === JSON.stringify(config.params) &&
      JSON.stringify(item.data) === JSON.stringify(config.data)
    ) {
      // 执行取消操作
      item.cancel('操作太频繁，请稍后再试')
      queue.splice(index, 1)
    }
  }
}
// request拦截器
service.interceptors.request.use(
  config => {
    // 是否需要设置 token
    const isToken = (config.headers || {}).isToken === false;
    if (getToken() && !isToken) {
      config.headers["Authorization"] = "Bearer " + getToken(); // 让每个请求携带自定义token 请根据实际情况自行修改
    }
    return config;
  },
  error => {
    console.log(error);
    Promise.reject(error);
  }
);

// 响应拦截器
service.interceptors.response.use(
  res => {
    // 未设置状态码则默认成功状态
    const code = res.data.code || 200;
    // 获取错误信息
    const msg = errorCode[code] || res.data.msg || errorCode["default"];
    if (code === 401) {
      MessageBox.confirm(
        "登录状态已过期，您可以继续留在该页面，或者重新登录",
        "系统提示",
        {
          confirmButtonText: "重新登录",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).then(() => {
        store.dispatch("LogOut").then(() => {
          location.href = "/index";
        });
      });
    } else if (code === 500) {
      Message({
        message: msg,
        type: "error"
      });
      return Promise.reject(new Error(msg));
    } else if (code !== 200) {
      Notification.error({
        title: msg
      });
      return Promise.reject("error");
    } else {
      return res.data;
    }
  },
  error => {
    console.log("err" + error);
    let { message } = error;
    if (message == "Network Error") {
      message = "后端接口连接异常";
    } else if (message.includes("timeout")) {
      message = "系统接口请求超时";
    } else if (message.includes("Request failed with status code")) {
      message = "系统接口" + message.substr(message.length - 3) + "异常";
    }
    Message({
      message: message,
      type: "error",
      duration: 5 * 1000
    });
    return Promise.reject(error);
  }
);

export default service;
